Some bike shops have gel pads that you sit on to measure the distance between your sit bones. Is it possible to take this measurement on your own at home, or does this really require special-purpose equipment?

5 Answers
5

Copied this from a saddle mfg website: How to measure your own sit bones

Of course the measure you really want is between the centres of your ischial tuberosities – the pointy lower parts of your pelvic bone on either side. Many bike dealers have a pad that you can sit on to measure this distance, but you can do it at home too.

Take a piece of aluminium kitchen foil and place it on a carpeted stair. Sit on the foil, lean forward a bit to approximate your riding position, then lift your feet. This should leave a good impression of your rear in the foil, and you can measure between the two points of deepest impression to get your sit bone width.

A saddle’s width is measured from edge to edge across the top, and Specialized recommends a 130mm saddle width for narrow, 143mm for medium and 155mm for wide. These ﬁgures should translate approximately across other ranges, with all other factors taken into account.

A fresh piece of corrugated cardboard on a hard surface such as a coffee table. Sit down and try to mimic the upper body position you have on your bike. Your sit bones change position based on how your pelvis is tilted. Your sit bones should crush the corrugated cardboard slightly and leave two indentations. Measure center to center as best you can.

You can't mimic your riding position, and get an impression of your sit bones. Using the position with your knees 4-6 inches above the impression material matches the method that manufacturers are using to get data to build their saddles, and is thus the most likely to match with the recommendations available on the market.
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zenbike♦Sep 9 '12 at 2:55

I should have quantified that my coffee table, if it were a bike, would be categorized as a low rider...
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802bikeguy.comSep 18 '12 at 4:10

1

Wouldn't it make more sense to do this on a bike?
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Neil FeinDec 2 '12 at 19:52

Fill a large size ziploc bag with icing sugar. Icing sugar's fine texture means that it binds together when compressed. This is what we want - it will hold the shape of your buttprint after you get up.

Close the bag making sure to squeeze out the air.

Place on hard chair.

Sit while assuming the degree of forward rotation that you intend to cycle with. The distance between your sit bones change depending on this rotation.